Transmission Lines: Permanent Field Repair of Leaks

§ 192.717 Transmission Lines: Permanent Field Repair of Leaks Each permanent field repair of a leak on a transmission line must be made by -#

(a)Removing the leak by cutting out and replacing a cylindrical piece of pipe; or#

(b)Repairing the leak by one of the following methods:#

(1)Install a full encirclement welded split sleeve of appropriate design, unless the transmission line is joined by mechanical couplings and operates at less than 40 percent of SMYS.#

(2)If the leak is due to a corrosion pit, install a properly designed bolt-on-leak clamp.#

(3)If the leak is due to a corrosion pit and on pipe of not more than 40,000 p.s.i. (267 MPa) SMYS, fillet weld over the pitted area a steel plate patch with rounded corners, of the same or greater thickness than the pipe, and not more than one-half of the diameter of the pipe in size.#

(4)If the leak is on a submerged offshore pipeline or submerged pipeline in inland navigable waters, mechanically apply a full encirclement split sleeve of appropriate design.#

(5)Apply a method that reliable engineering tests and analyses show can permanently#